Answer: 0.1 or 
Step-by-step explanation:

= 
Answer:
7a-12
Step-by-step explanation:
explanation is in the pic.
if it helps don't forget to like and mark me down
Answer:
angle 1=
°
Step-by-step explanation:
to find the angle of 1 you should know angle 2, what is angle 2?
angle
° and angle
are symetrical so they have the same value.
now that we know that angle 2 is equal to
°
then what is angle 1
if the whole line has an angle of
° and angle
°.
so the equation will be :

flip the equation to find
:

the angle 1 which we found in the given equation is 135
check if my answer is correct is :

my equation is correct
Answer:
The two circles centered at point A are concentric and similar.